Mercurial > hg > graal-jvmci-8
annotate src/share/vm/prims/methodComparator.hpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
parents | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |
26 #define SHARE_VM_PRIMS_METHODCOMPARATOR_HPP | |
27 | |
28 #include "interpreter/bytecodeStream.hpp" | |
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29 #include "oops/constantPool.hpp" |
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30 #include "oops/method.hpp" |
1972 | 31 |
0 | 32 class BciMap; |
33 | |
34 // methodComparator provides an interface for determining if methods of | |
35 // different versions of classes are equivalent or switchable | |
36 | |
37 class MethodComparator { | |
38 private: | |
39 static BytecodeStream *_s_old, *_s_new; | |
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40 static ConstantPool* _old_cp; |
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41 static ConstantPool* _new_cp; |
0 | 42 static BciMap *_bci_map; |
43 static bool _switchable_test; | |
44 static GrowableArray<int> *_fwd_jmps; | |
45 | |
46 static bool args_same(Bytecodes::Code c_old, Bytecodes::Code c_new); | |
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47 static bool pool_constants_same(int cpi_old, int cpi_new); |
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48 static int check_stack_and_locals_size(Method* old_method, Method* new_method); |
0 | 49 |
50 public: | |
51 // Check if the new method is equivalent to the old one modulo constant pool (EMCP). | |
52 // Intuitive definition: two versions of the same method are EMCP, if they don't differ | |
53 // on the source code level. Practically, we check whether the only difference between | |
54 // method versions is some constantpool indices embedded into the bytecodes, and whether | |
55 // these indices eventually point to the same constants for both method versions. | |
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56 static bool methods_EMCP(Method* old_method, Method* new_method); |
0 | 57 |
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58 static bool methods_switchable(Method* old_method, Method* new_method, BciMap &bci_map); |
0 | 59 }; |
60 | |
61 | |
62 // ByteCode Index Map. For two versions of the same method, where the new version may contain | |
63 // fragments not found in the old version, provides a mapping from an index of a bytecode in | |
64 // the old method to the index of the same bytecode in the new method. | |
65 | |
66 class BciMap { | |
67 private: | |
68 int *_old_bci, *_new_st_bci, *_new_end_bci; | |
69 int _cur_size, _cur_pos; | |
70 int _pos; | |
71 | |
72 public: | |
73 BciMap() { | |
74 _cur_size = 50; | |
75 _old_bci = (int*) malloc(sizeof(int) * _cur_size); | |
76 _new_st_bci = (int*) malloc(sizeof(int) * _cur_size); | |
77 _new_end_bci = (int*) malloc(sizeof(int) * _cur_size); | |
78 _cur_pos = 0; | |
79 } | |
80 | |
81 ~BciMap() { | |
82 free(_old_bci); | |
83 free(_new_st_bci); | |
84 free(_new_end_bci); | |
85 } | |
86 | |
87 // Store the position of an added fragment, e.g. | |
88 // | |
89 // |<- old_bci | |
90 // ----------------------------------------- | |
91 // Old method |invokevirtual 5|aload 1|... | |
92 // ----------------------------------------- | |
93 // | |
94 // |<- new_st_bci |<- new_end_bci | |
95 // -------------------------------------------------------------------- | |
96 // New method |invokevirual 5|aload 2|invokevirtual 6|aload 1|... | |
97 // -------------------------------------------------------------------- | |
98 // ^^^^^^^^^^^^^^^^^^^^^^^^ | |
99 // Added fragment | |
100 | |
101 void store_fragment_location(int old_bci, int new_st_bci, int new_end_bci) { | |
102 if (_cur_pos == _cur_size) { | |
103 _cur_size += 10; | |
104 _old_bci = (int*) realloc(_old_bci, sizeof(int) * _cur_size); | |
105 _new_st_bci = (int*) realloc(_new_st_bci, sizeof(int) * _cur_size); | |
106 _new_end_bci = (int*) realloc(_new_end_bci, sizeof(int) * _cur_size); | |
107 } | |
108 _old_bci[_cur_pos] = old_bci; | |
109 _new_st_bci[_cur_pos] = new_st_bci; | |
110 _new_end_bci[_cur_pos] = new_end_bci; | |
111 _cur_pos++; | |
112 } | |
113 | |
114 int new_bci_for_old(int old_bci) { | |
115 if (_cur_pos == 0 || old_bci < _old_bci[0]) return old_bci; | |
116 _pos = 1; | |
117 while (_pos < _cur_pos && old_bci >= _old_bci[_pos]) | |
118 _pos++; | |
119 return _new_end_bci[_pos-1] + (old_bci - _old_bci[_pos-1]); | |
120 } | |
121 | |
122 // Test if two indexes - one in the old method and another in the new one - correspond | |
123 // to the same bytecode | |
124 bool old_and_new_locations_same(int old_dest_bci, int new_dest_bci) { | |
125 if (new_bci_for_old(old_dest_bci) == new_dest_bci) | |
126 return true; | |
127 else if (_old_bci[_pos-1] == old_dest_bci) | |
128 return (new_dest_bci == _new_st_bci[_pos-1]); | |
129 else return false; | |
130 } | |
131 }; | |
1972 | 132 |
133 #endif // SHARE_VM_PRIMS_METHODCOMPARATOR_HPP |